diff --git a/CMakeLists.txt b/CMakeLists.txt
index c913a6c..76d4696 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,7 @@ set(TARGET_C_SRC
         ${CMAKE_SOURCE_DIR}/src/gd32e23x_it.c
         ${CMAKE_SOURCE_DIR}/src/systick.c
         ${CMAKE_SOURCE_DIR}/src/ultrasonic_driver.c
+        ${CMAKE_SOURCE_DIR}/src/input_capture_exp.c
 )
 
 add_executable(xlsw_3dp_ultrasonic_300K ${TARGET_C_SRC})
diff --git a/inc/input_capture_exp.h b/inc/input_capture_exp.h
new file mode 100644
index 0000000..987ba28
--- /dev/null
+++ b/inc/input_capture_exp.h
@@ -0,0 +1,8 @@
+//
+// Created by yelv1 on 24-9-23.
+//
+
+#ifndef INPUT_CAPTURE_EXP_H
+#define INPUT_CAPTURE_EXP_H
+
+#endif //INPUT_CAPTURE_EXP_H
diff --git a/src/input_capture_exp.c b/src/input_capture_exp.c
new file mode 100644
index 0000000..7f9586f
--- /dev/null
+++ b/src/input_capture_exp.c
@@ -0,0 +1,7 @@
+//
+// Created by yelv1 on 24-9-23.
+//
+
+#include "input_capture_exp.h"
+#include "gd32e23x.h"
+
diff --git a/src/main.c b/src/main.c
index 8ebb333..4c837d8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -25,8 +25,8 @@ int main(void)
     /* configure systick */
     systick_config();
     /* configure ultrasonic board hardware */
-    ultrasonic_config();
-
+    // ultrasonic_config();
+    usart_config();
 
     /* ---------- debug start ---------- */
 
@@ -43,9 +43,7 @@ int main(void)
 
     while(1)
     {
-        delay_ms(50);
-        ultrasonic_pwm_out_cycles(ULTRASONIC_CYCLES);
-        // printf("Send ultra sonic driver signal!\r\n");
+
     }
 }